person sleeping in bed listening to white noise

Does White Noise Help You Sleep? Exploring the Evidence Behind Sleep Sounds

Jul 24, 2026

Quick answer: White noise for sleep works primarily by masking sudden environmental sounds that cause micro-arousals. Some studies show adults fall asleep up to 38% faster with it. However, evidence is mixed, it works best for those in noisy environments. Pink noise sleep and brown noise sleep may offer additional benefits for deep sleep and relaxation.

You're exhausted. You climb into bed, close your eyes, and then a car alarm goes off outside. Or your neighbour's TV bleeds through the wall. Or your partner starts snoring. Sound familiar?

Poor sleep caused by environmental noise is incredibly common. The World Health Organisation estimates that nearly 25% of the population suffers from disturbed sleep due to noise. For shift workers, city dwellers, and light sleepers, the problem is even more acute. Small wonder, then, that sleep sounds and white noise machines have exploded in popularity as a potential fix.

But does the science actually back it up?

And if you're going to try sound therapy, which type of noise gives you the best chance of a genuinely restful night? This guide breaks down everything you need to know, including why sound alone can't fix every sleep problem.

What Is White Noise?

White noise is a specific type of sound that contains every audible frequency, roughly 20 to 20,000 hertz, played at equal intensity. The result is a steady, continuous hiss. Think of the static from an untuned radio, the whirr of a fan, or the hum of an air conditioning unit.

The reason white noise for sleep can be effective comes down to a process called sound masking. Your brain doesn't fully switch off during sleep, it continues to monitor your environment for potentially important sounds. When a sudden noise (a slamming door, a passing lorry) cuts through the quiet, the contrast triggers a micro-arousal, even if you don't fully wake up. White noise raises the background audio baseline, reducing that contrast and making sudden noises less likely to disturb you.

Think of it like this: a single candle is blinding in a pitch-black room, but barely noticeable in a brightly lit one. White noise is the ambient light for your ears.

White Noise vs Pink Noise vs Brown Noise: What's the Difference?

"White noise" is often used as a catch-all term, but acoustic science distinguishes between several distinct types. Here's how the main three compare:

Noise Type	Sound Profile	Examples	Best For
White noise	Equal energy across all frequencies; high-pitched hiss	Fan, static, air conditioner	Blocking sharp, sudden sounds
Pink noise sleep	Bass-heavy; power decreases as frequency rises	Rainfall, rustling leaves, gentle waves	Overall sleep quality, deep sleep support
Brown noise sleep	Deep, rumbling; very low frequencies dominant	Heavy thunderstorm, waterfall, jet engine hum	Deep relaxation, anxiety reduction

Pink noise sleep is generally considered gentler and more pleasant to listen to than white noise, making it easier to tolerate over longer periods. Brown noise sleep, meanwhile, drops high frequencies almost entirely, ideal for those who find higher-pitched sounds irritating, though it's slightly less effective at masking sharp environmental interruptions.

Can Sleep Sounds Improve Sleep Quality?

The research is promising, but not without caveats.

Key findings in favour of sleep sounds:

Adults fell asleep up to 38% faster when listening to white noise, according to a study published in Frontiers in Neurology (Messineo et al., 2017)
A 2021 study (Sleep Medicine, Ebben et al.) found that New York City residents complaining of noise-related sleep disruption experienced significantly reduced sleep latency and improved sleep efficiency when using a white noise machine
A 2022 study found that white noise played through headphones improved sleep quality for critically ill patients in loud hospital wards (Warjri et al., Nursing in Critical Care)
For pink noise sleep, a review in Nature found positive results in approximately 82% of studies, compared to just 33% for white noise, suggesting pink noise may be particularly effective for deep sleep

Where the evidence gets complicated:

A systematic review published in Sleep Medicine Reviews (Riedy et al., 2021), which examined 38 studies, concluded that the overall quality of evidence supporting continuous noise as a sleep sound machine aid is "very low." Researchers noted that while some studies showed benefit, others found that continuous noise could actually disrupt sleep stages, including REM sleep.

Dr Sogol Javaheri, Assistant Professor at Harvard Medical School, advises caution: white noise "may interrupt important stages of sleep" if played too loudly or throughout the entire night. Her recommendation is to use a sleep sound machine at low volume, positioned in a corner of the room, and ideally on a timer so it switches off once you've drifted off.

The bottom line: White noise for sleep works best as a tool for specific situations, particularly noisy environments, rather than as a universal remedy.

Who Should Use a White Noise Machine?

A white noise machine isn't for everyone. But for certain groups, it can make a meaningful difference:

City dwellers and flat residents - Chronic exposure to urban noise (traffic, sirens, neighbours) reduces sleep quality over time and elevates stress hormones like cortisol. Sound masking directly addresses this trigger
Shift workers - Nurses, emergency responders, and anyone sleeping during daylight hours face a relentless barrage of daytime sound. A sleep sound machine can be practically essential in these circumstances
Parents and newborns - The womb is a naturally loud environment. White noise mimics those familiar sounds, helping to settle infants while allowing parents to move around the house without causing a wake-up
Tinnitus sufferers - Constant internal ringing becomes far more distressing in silence. A steady background sound reduces the contrast, making the condition easier to manage at night
Light sleepers - Those who are particularly sensitive to noise may find that a consistent audio baseline allows them to sleep through sounds they'd otherwise react to

Creating a Better Sleep Environment Beyond Sound

Here's a point that gets overlooked: white noise for sleep is a masking tool, not a sleep cure. If you're waking up with neck pain, a stiff back, or numb shoulders, no amount of white noise or pink noise sleep will solve the problem. Physical discomfort disrupts sleep architecture regardless of what's playing in the background.

A truly restorative night's sleep depends on the right physical foundation. Here at Putnams, every pillow and sleep support product is handmade in Devon from premium materials, designed to align your spine, reduce pressure points, and keep you comfortable throughout the night. If you're a side sleeper struggling with shoulder tension, a white noise machine won't help, but the right pillow will.

For a complete sleep environment, consider:

Physical support A pillow that maintains neutral spinal alignment reduces the tossing and turning that fragments sleep. Putnams' Putnam Pillow and Organic Buckwheat Hull Pillow are both designed with posture and pressure relief in mind
Temperature Your core body temperature needs to drop to initiate sleep. Aim for a bedroom temperature of 15–19°C, and consider breathable, natural bedding. Putnams' British Wool bedding range offers excellent temperature regulation
Darkness Light suppresses melatonin production. Blackout curtains and removing screen-based devices at least an hour before bed make a measurable difference
Sound Use a sleep sound machine or app at a low volume (well below 70 decibels, which the CDC identifies as the threshold for potential long-term hearing damage) on a timer, so it doesn't run all night unnecessarily
Lifestyle habits Limit caffeine after mid-afternoon. Alcohol may feel sedating, but it significantly fragments sleep architecture and reduces the restorative REM cycles you need

White noise works best as one layer in a broader sleep strategy, not a standalone solution.

Frequently Asked Questions About White Noise and Sleep

Does white noise help you sleep better if you don't live in a noisy area?

Probably not significantly. The primary mechanism behind white noise for sleep is sound masking, reducing the contrast between background quiet and sudden disruptive sounds. If your environment is already quiet, the evidence for benefit is weak. In fact, adding sound to an already-quiet bedroom may introduce unnecessary auditory stimulation. For general sleep difficulties, sleep hygiene improvements and proper physical sleep support are likely to be more effective.

Is white noise good for deep sleep, or is pink noise better?

Research suggests pink noise sleep may be more beneficial for deep sleep specifically. A study cited in Frontiers In Neuroscience (Papalambros, 2017) found that pink noise synchronised with brain waves increased slow-wave (deep) sleep in older adults and improved next-day memory recall. White noise is more effective at masking sudden environmental sounds, but pink noise sleep appears to offer broader restorative benefits.

What volume should a white noise machine be set to for sleep?

Keep it as quiet as possible while still masking the sounds that disturb you. The CDC advises that regular exposure to sounds above 70 decibels can damage hearing over time, city traffic typically sits around that level. Position your sleep sound machine in a corner of the room rather than directly beside your head, and use a sleep timer if available.

Can white noise cause harm if used every night?

Potentially, yes, particularly at high volumes. Researchers have raised concerns about long-term auditory system activity without downtime, the risk of noise-induced hearing changes, and the possibility of masking important sounds (fire alarms, a baby crying). There is also a risk of dependency: some people find they cannot sleep without a white noise machine once they've used one regularly. Use it at low volume, on a timer, and treat it as a complement to good sleep habits rather than a replacement.

What are the best sleep sounds for falling asleep quickly?

According to the available evidence, white noise or pink noise are the most studied options for reducing the time it takes to fall asleep. However, individual preference matters significantly. Some people find brown noise sleep (a deep, rumbling sound) more relaxing; others respond better to nature sounds or gentle rainfall. Experiment with different options using a sleep sound machine or app and monitor how you feel after a week of consistent use.

The Sleep Environment Is More Than Just Sound

Sound therapy can genuinely help, particularly for those dealing with noisy environments, shift work, or tinnitus. The evidence for white noise for sleep is real, if limited. Pink noise sleep shows even more promise for deep sleep quality. And brown noise sleep offers a compelling alternative for those who find higher-pitched sounds uncomfortable.

But sleep is a whole-body experience. Physical comfort, temperature, darkness, and lifestyle habits all play equally important roles. If you're serious about improving your rest, address each element in turn. Start with the foundation, your pillow, your posture, your bedding, and let sound therapy enhance what's already working.

Explore Putnams' full range of handmade sleep support products and find the comfort your sleep has been missing.